International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Micro-drilling (MD or мD) is type of machining (processing) technology used for the drilling of miniaturized parts of small diameter in micro-scale, ie. diameter in a range of a few microns to several hundred microns. In paper is given the dependence of axial efforts and torque on different modes of depth of drilling in micro-drilling with micro-drills from solid alloy VK60M with standard rake angle ω=300 and f=0.01 [mm/turn

One of the most expected and the most desired implementation of modern technologies is the concept of a Smart City. Meanwhile there are many buzz-words known to describe the ability of implementation of many approaches to provide control for Smart City. Many of such technologies had become known for Industry 4.0 concept, including 5G mobile Internet and autonomous aerial vehicles (so called drones). Nevertheless, there is an open question of how to provide and support limits where and when UAV (unmanned aerial vehicle) should be able or not to fly over the city. Naturally, the self-driven drones equipped with a batch of sensors and able to avoid some  obstacles would not be enough for everyday use within Smart City. Current paper is focused on discussion of possible solution to provide UAV with up-to-date data on restrictions, that may be required in a modern city.

This publication analyzes the opportunities, problems and challenges associated with the implementation of Industry 4.0 in Bulgarian industrial enterprises in condition of a dynamic changing competitive environment and extending digitalization. An analysis is made on the base of the four fundamental principles that are used for application of solutions related to the implementation of Industry 4.0 and that influence on the organizational activities in all functional areas in the industrial enterprise. Various industrial sectors are analyzed to identify the trends, problems and challenges of the introduction of Industry 4.0 in manufacturing activities. Opportunities for improving their competitiveness are identified by means of using the principles and advantages of the modern digitalization. Up-to-date statistics and various methods for analyzing of the existing information are used. The specifics of development of the leading sectors in Bulgarian economy  are identified. The results show that there is a growing number of Bulgarian industrial enterprises focused on deploying Industry 4.0 to reach new higher levels of productivity, quality and efficiency. This is a new approach in seeking favorable opportunities for their further sustainable development and competitiveness. Some fundamental problems, challenges and barriers in industrial enterprises, in the process of introduction of digitalization in the industry are discussed, which hinder the fast pace of their development. As a result of this analysis are presented some appropriate solutions.

The use of mathematical models of control processes in foundry such as: K-test and Chemical spectral analysis is a good set of mathematics (thermal conductivity theory) and theoretical physics (first-order phase transition) are important elements for ensuring high quality castings in micro-foundries.
The idea of estimating the overheating of a liquid metal alloy based on the appearance of a curing process upon filling has been developed. These control processes combined with zone refining are an important opportunity to create a waste-free foundry in a circular economy in Industry 4.0.

Technology and innovations have powered the evolution of Industry4.0, the fourth industrial revolution.
State-of-the-art technologies such as the Internet of Things (IoT), cloud computing (CC), big data analytics (BDA), and artificial intelligence (AI) – all part of Industry4.0, have greatly stimulated the building industry. Digital Тwin is a significant enabler for Industry 4.0 initiatives. Within Industry 4.0, the amount of digital product information generated and collected over the entire lifecycle has been growing.
Although digital twins have been around for several decades, the rapid rise of the internet of things (IoT) is that they have become more widely considered as a tool of the future. Digital twins are getting attention because they also integrate things like artificial intelligence (AI) and machine learning (ML) to bring data, algorithms, and context together
A ―digital twin‖—or digital replica of a physical entity—can target building industry in several sub-areas:
– Facility management
– Product Lifecycle Management
– Smart Buildings
– Smart energy
All these areas are one giant step further by creating a Digital Twin — a virtual representation of real-world buildings that can be viewed and scrutinized in minute detail. This research describes business cases and best practices in design of IoT Solutions for building industry, powered by Digital Twins. A reference architecture and prototypes which demonstrate application of Digital Twins in Smart are created as a result of this study .This research is technology agnostic, but prototypes of sample solutions are considered in the context of Microsoft Azure (Azure solutions, covering Azure Digital Twins Service and Azure IoT Stack.)

The paper describes the definitions of industry 4.0 and the factors that influence their formation. It describes the areas
that it affects and which are involved in the formation of a new generation industry. Paper also discusses problems that arise in areas related to industry 4.0 when combining them and possible ways to solve them, especially the organization of the production process. Making a focus on properties of software for industrial devices.

Monitoring and control of Cyber-Physical Systems (CPS) have many challenges related to the heterogeneous environment, the high degree of interaction between the components and the high requirements for functionality and scale. The paper presents an analysis of the state of the art in this area and proposes and analyses different combined approaches for control of CPS based on IEC-61499 standard. The approaches are divided in two groups. The first group of approaches combines IEC-61499 standard with advanced methods of software engineering, such as formal methods and model-driven development, based on UML/SysML. The second group uses other standards as IEC- 61512 and PLCopen to be combined with IEC-61499 standard in order to improve the development lifecycle of cyber-physical systems.

Wet wipe machines are machines for high capacity production at high speeds. Even the short downtimes of the machines in the production area lead to huge losses for manufacturers. However, in these machines; unexpected breakdowns such as belt breakage, bearing damage, sensor motor failures, pneumatic air leaks are frequently encountered. In order to prevent unwanted stoppages, a sensor, actuator and plc based application has been implemented to prevent failure parameters and to detect faultlessly by monitoring the operation parameters. As a result of the studies carried out, our wet wipe machines that we produce have been adapted to the industry 4.0 concept.

New generation of digitized factories in Industry 4.0 is based on a combination of cyber-physical systems (CPS) and digital technologies, to provide an integrated and intelligent synergy in production process, linking the physical, digital and virtual world. Industry 4.0 uses production systems, CPS, CPPS, SCPS and robots in combination with digital technologies IoS, IoP, IoT, IIoT, IoE, CC and etc. The digital infrastructure of a country can be evaluated using different development indices, such as: IDI, EGDI, TII, OSI and etc. The paper is given of trend analyzes of development indices (DI) for using ICT and the Internet., EGDI and TII in Georgia for the period 2003 to 2018.

Industry 4.0 includes the integration of Safety and Security. Their interconnection (influencing) is assumed. Application of control systems within Safety and Security changes the static principle to dynamic, assumes identification of all production and distribution processes, data mobility as a part of BIG DATA technology and human factor activity while ensuring the functionality of relevant applications. Industry Strategy 4.0 requires a proactive approach in risk analysis, based on the implementation of Safety and Security principles in the development and design phase of machines and complex technologies in the context of the use of CPS principles. It is important that rapid responses to the system’s problems are monitored effectively, with simultaneous exchange of information at individual levels in the production process.

Resource planning in manufacturing companies is crucial in the context of Industry 4.0. Enterprise Resource Planning (ERP) systems that enable vertical and horizontal integration between different operational and management levels are essential for monitoring process execution through real-time data access and for making decisions according to these data.
The implementation of the ERP system is one of the key indicators highlighted by the European Commission (more than 100 indicators) in the Digital Agenda for Europe (A Europe 2020 Initiative), which sets the goals for the growth of the European Union by 2020. It is important to make an analysis of the state of implementation of the ERP systems in the Republic of Croatia. We researched within the metalworking industry in Croatia. Purpose of the research conducted is to determine the state of implementation of ERP systems in metalworking companies and on the compliance of ERP systems with Industry 4.0 and to investigate the opinions of ERP system users on the extent to which the ERP system they use meets the requirements of Industry 4.0.
The main objective of our paper is twofold: to present the features of modern ERP systems in the Industry 4.0 framework and to present the results of our research.

Industry 4.0 is changing the structure and scope of accountants’ qualification profile by imposing new challenging requirements regarding their skills and competences. The paper is inspired by the increasing digitalisation of businesses and the impact of technology innovations and their augmented application on the accounting higher education. The aim of the research is to outline and discuss the challenges for accounting educators due to the required knowledge and skills from graduates in the Industry 4.0 context. A special attention is given to the need for building strong and effective communication and information links with the business partners and  professional bodies. The benefits for universities of becoming part of clusters are also discussed in more details.